Section 250-153-10 - TRANSFER OR SUBSTITUTION OF MOTOR VEHICLESA. In the event of the replacement of an authorized motor vehicle by a new unit of equipment, carriers must first file with the Secretary an Equipment Identification List describing the new motor vehicle to be placed in service, and must apply the permit number to the motor vehicle as set forth in Rule 7A. B. In the event of accident or breakdown necessitating the discontinuance of operation of an authorized motor vehicle, the operator may immediately procure emergency equipment so that the passengers being, or to be, transported by the disabled vehicle may be carried to its destination with the least possible delay. The facts in connection with the use of emergency equipment shall be reported immediately in writing to the Secretary describing such motor vehicle, and providing evidence of insurance or bond coverage as set forth in Rule 8. Use of emergency equipment as herein described is valid for one trip only.29- 250 C.M.R. ch. 153, § 10